Is the number of light bulbs that burn out in the next year in a room with 19 bulbs a discrete random variable, continuous random variable, or not a random variable?

How many $20 bills do you need to have to make $280

Find the maximum value of p= 4x + 5y subject to the following constraints :

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p.mc) knowing that it is going to rain tomorrow, and going to bed before 9 p.md) knowing that you have a test in school tomorrow, and studying thw night before